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Arithmetic for 4th grade elementary school students (H29_2017 edition)
  
There is a list of various problems at the link.
Calculation problems created with random numbers are the main ones.
Fourth grade arithmetic
- More than 100 million units
 - Tables and graphs
 - Division pen calculation (divide by 1 digit number)
 - Shapes and angles
 - Decimals and strokes
 - Division pen calculation (divide by a two-digit number)
 - Approximate number
 - Order of calculations, how to use parentheses
 - Shapes: vertical and various rectangles
 - True fractions, mantissa fractions, and band fractions
 - Area・㎠
 - Multiplication and division of decimal numbers
 - Three-dimensional